jQuery 选中tr下面的第某个td

 1 <table class="layui-table" id="alertTable" style="margin: 0 auto; width: 100%;">
 2     <thead>
 3         <tr>
 4           <th>日期</th>
 5           <th>经度</th>
 6           <th>纬度</th>
 7           <th>距最近点距离</th>
 8         </tr>
 9     </thead>
10     <tbody>
11         <tr class="alertChart">
12            <td>
13                <input type="hidden" value="92" />2017-06-01 16:57:25</td>
14            <td>110.23568</td>
15            <td>125.23564</td>
16            <td>25.2m</td>
17         </tr>
18     </tbody>
19 </table>

1 $(‘.alertChart‘).dblclick(function(){
2        alert( $(this).children(‘td‘).eq(0).children(‘input‘).val() ) ;
3 });